When using the “Duplicate Project” function, add in two options:
Mark all Tasks as Incomplete
Mark all Subtasks as Incomplete
If a board was not originally created as a template, this would allow you to create a template from a recent board without having to backtrack and mark all tasks and subtasks as incomplete.
I’m surprised this doesn’t have more replies! I have the same concern — when I duplicate a completed project, all the tasks on the duplicate project retain the completion status of those on the original project.
When duplicating a project, in the window where you can check which project & task attributes you would like maintained in the new project, 2 new options should be added: one for task completion status and another for subtask completion status. If you were to check these options, then the completion status of all tasks and/or subtasks (respectively) on the new project would match that of the original project. If you did not check them, then the completion status of all tasks and/or subtasks (respectively) on the new project would be incomplete by default.
I hope the Asana team will add this feature, or at least a feature to mark all tasks & subtasks incomplete in a project without having to select them all!